I live in Bournemouth and it's a very hard water area so obviously an RO would make sense if i get into th?is game seriously. But at the moment I am just doing bungalows. If I start on houses and use a DI just for the 1st floor and do trad on the ground floor is it worth it? I was thinking of this because I live in shared house and a cheap RO would give out a lot of waste water and not sure the landlord would approve! With a DI ( I was recommended two 11 litre resin vessels) I could try it and then if I move onto an RO I would already have the DIs which I would need anyway? I could also just keep all my equipment in the back of my car as well.